21341154757 has 18 divisors (see below), whose sum is σ = 23766261414. Its totient is φ = 19049472720.

The previous prime is 21341154719. The next prime is 21341154763. The reversal of 21341154757 is 75745114312.

It can be written as a sum of positive squares in only one way, i.e., 14774645601 + 6566509156 = 121551^2 + 81034^2 .

It is not a de Polignac number, because 21341154757 - 2¹⁹ = 21340630469 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21341154707) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 16327698 + ... + 16329004.

Almost surely, 2^21341154757 is an apocalyptic number.

It is an amenable number.

21341154757 is a deficient number, since it is larger than the sum of its proper divisors (2425106657).

21341154757 is an frugal number, since it uses more digits than its factorization.

21341154757 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2689 (or 1351 counting only the distinct ones).

The product of its digits is 117600, while the sum is 40.

The spelling of 21341154757 in words is "twenty-one billion, three hundred forty-one million, one hundred fifty-four thousand, seven hundred fifty-seven".